Attachment for screw-machines.



No. 635,|47. Patentedl Oct. I7, |899. W. K. SANDSTRUM & E. BUMMER. ATTACHMENT FOB SCREW MACHINES.

' (Application ilad Nov. 29, 1898.)

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N0. 635,|47, Patented Bcf. I7, |899. W. K. SANDSTRM & E. BMMER. ATTACHMENT FCR SCREW MACHINES.

(Application leiNov. 29, 1898.) (No Model.) 3 Sheets-Sheet 2.

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ATTACHMENT FDR SCREW MAGHINES.

(Application filed. Nov. 29, 1898.) (No Model.) 3 Sheets-Sheet 3.

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VILLIAM K. SANDSTROM AND EMIL BOMMER, OF NEV YRK, N. Y.; SAID SANDSTROM ASSIGNOR TO SAID BOMMER.

ATTACHMENT FOR SCREW-MACHINES.

SPECIFICATION forming part of Letters Patent No. 635,147, dated October 1'7, 1899.

Application filed November 29,1898. Serial No. 697.736. (No model.)

To all whom t may concern:

Be it known that we, WILLIAM K. SAND- sTRoM and EMIL BOMMER, citizens of the United States, residing in the city of New York, in the borough of Brooklyn and State of New York, have invented certain new and useful Improvements in Attachments for Screw-Machines, of which the following is a specification.

1o Our invention relates to an improved attachment for screw-machines, whether operated automatically or by hand, by which with each Vfull rotation of the tool-stock as many nipples, ball-tips,A cones, or' other articles i 5 may be made and completely inished as there are tools of the same" kind arranged in the tool-stock, said nipples, ball-tips, cones, or other articles being made from a metallic rod which is automatically fed forward and subzo jected to the action of the operating-tools supported, respectively, by our improved attachment, the tool-stock, and the slide-rest, so that the screw-machine is adapted to turn out the special articles to be made thereon in a quicker and more effective manner than with the screw machines heretofore in use, in which only one article can be made for each full rotation of the tool-stock.

For this purpose our improvement consists 3o in the combination, with a screw-machine, of a curved arm supported parallel with the work-holder and provided with an eye-shaped end or terminal, a centering-sleeve, and

means for holding a tool inserted in said 3 5 sleeve, said centering-sleeve, work-holder, and tool being in axial alinement with each other.

The invention consists, further, of the eenn tering sleeve in the curved arm, provided with 4o stop pins or projections on the side facing the metallic rod from which the articles are made, and of a tubular scoring-tool that is guided in the centering-sleeve and provided with an exterior shoulder at the end facing the toolholder, said tubular scoring-tool being engaged by a spring and moved forward at thel proper time against the tension of the spring by the action of the tool-holder for operating on the face of the blank.

5o The invention consists, further, of certain details of construction by which the successive operations of the operating-tools are accomplished, as will be fully described hereinafter, and iinally pointed out in the claims.

In the accompanying drawings, Figure l represents a plan view of our improved attachment for screw-machines, shown as applied to an automatic screw-machine. Fig.

2 is an end elevation of a portion of the machine shown in Fig. l, drawn on a larger 6o scale, so as to show the operating-tools more distinctly. Fig. 3 is a side elevation of our improved attachment, partly in vertical section, through the supports of the same. Fig. t is a side elevation of the lower part of the attachment drawn on a larger scale. Figs. 5 and 6 are a vertical longitudinal section and a vertical transverse section, respectively, on lines 5 5, Fig. 6, and 6 6, Fig. it. Figs. 7 and S are respectively a vertical longitudinal sec- 7o tion and an end elevation of the lower part of the attachment, showing thesame without a tubular cutting-tool; and Fig. 9 is a vertical central section of a bali-tip or similar article made by our improved attachment for screw-machines.

Similar letters of reference indicate correspending parts.

Referring to the drawings, A represents the Work-holder of a hand or automatic screw- 8o machine, and AX a chuck at the end of the same. 1 The work-holder A is guided i-n a tup bular axle and rotated by a belt and pulley in the usual manner. The work-holder A is intermittently fed forward by means of a clutch arrangement A and by means of cams A2, located on the cam-shaft S of the machine, said cams being provided with asI many projections on their circumferences as are required for producing the forward motion of 9o the metallic rod d in the work-holder as many times for each full rotation of the cam-shaft as there are tools in the tool-stock. The clutch A and its operating mechanisms used for this purpose are well known and require, therefore, no special description.

The tool-stock B is Vpreferably of a cylindrical cross-section and mounted upon a horizontal shaft l), which is supported in the stationary framework of the machine and ar- Ico ranged opposite to and in line with the workholdcr. The tool-stock B serves to support a number of tools of the same kind, their number corresponding to the number of nipples, ball-tips, cones, or other articles Which it is desired to produce at each full rotation of the cam-shaft. The tool-stock of the screwmachine shown in the drawings is in this instance arranged for five drilling-tools, which are secured in as many sockets arranged on the face of the tool-stock. The actuatingcam B on the cam-shaft S and the transmitting mechanisms for imparting motion -to the tool-stock B are so arranged and timed that five articles can be made for each full rotation of the cam-shaft and tool-stock. Below the chuck AX of the Work-holder A is arranged a laterally-reciprocating slide-rest C, which carries at one side of its center line the forming-tool C and at the opposite side of the same the cutting-ofi:` tool C2. The sliderest C is operated by cams C3 on the camshaft and the usual motion transmitting mechanism, (shown in Fig. 1,) so as to be reciprocated five times for each full rotation of the cam-shaft.

In front of the Work-holder and intermediately between the end of the same and the tool-stock is interposed a curved arm D, the shank D of Which is supported parallel with the Work-holder,in suitable bearings cl2 of an auxiliary support D2, the pillars of which are in this instance shown attached by screwbolts d' to the supports of the tubular axle in which the Work -holder A is supported. The shank D of the curved arm D is made with square portions Z3 as far as it is located in the bearings cl2, which bearings are correspondingly shaped, so as to secure the shank of the curvedarm rigidly in position. Adjacent to the square portions d3 of the shank D arev arranged screw-threaded portions d4, to Which are applied jam-nuts d5, which are screwed up against the outer faces of the bearings d2 and Which permit the adjustment of the curved arm D tothe required position relatively to the Work-holder and tool-stock and the rigid support of the same after the proper adjustment has been made. The end of the curved arm D is made With an eyeshaped terminal d, Which is bored out so as to support a centering-sleeve E, that is iirmly secured to the eye-shaped terminal of the arm D by means of a set-screw e, which engages a depression in the circumference of the centering-sleeve E, as shown in Fig. 6. The centering-sleeve E is provided at the end facing the Work-holder With one or more stop pins or projections e', which serve to arrest the metallic rod as the saine is fed forward in the work-holder. The stop pins or projections e' are secured into sockets of the centeringsleeve E of the eye-shaped end of the arm D or are made integral with said centeringsleeve. In the centering-sleeve E is arranged a tubular scoring-tool F, Which is guided by means of a lug fin a longitudinal slot f of the centering-sleeve F., as shown in Fig. 5. The cutting edge of the scoring-tool F is located adjacent to the Work-holder, While the opposite end is provided With a shoulder f2, which is engaged by the free recessed end of a flat spring F', which is attached at its upper end to the arm D and which serves to hold the tubular scoring-tool in normal position,- so that its cutting edge is located inside of the ends of the stop pins or projections e', as shown in Figs. 4 and 5. The tubular scoring-tool F is only used When the bottom of the article to be produced has to be provided With a depression, as shown in Fig. 9. There are numerous articles which can be made by our improved attachment in which this scoring is not required. The scoring-tool is in such cases dispensed With and the end of the curved arm only provided With the centeringsleeve E, having stop pins or projections e', as shown in Figs. 7 and 8.

When the curved arm D, With its centeringsleeve E, is applied to an ordinary hand or automatic screW-machine,a separate spottingtool for centering for the point of the drill, a separate stop-tool for stopping the blank, and a separate scoring-tool in case a depression is desired on the face of the blank are not required in the tool-stock. As all these Separate operations are performed almost sim ultaneously by the use of our attachment, it appears that the functions of the above-mentioned tools are transferred from the toolstock to the centering-sleeve and its scoringtool, supported by thecurved arm, and the special tools which Were heretofore required in the tool-stock for these purposes are dispensed With, so that the tool-stock can be used exclusivelyfor carrying tools of the same kind, permitting thereby the machine to make for each full rotation of the cam-shaft and tool-stock as many articles as there are tools in the tool-stock, While heretofore only one separate article could be made for everyfull rotation of the cam-shaft. This gives the additional advantage that each tool in the toolstock, after having entirely completed a nipple, ball-tip, cone, or other article, is out of action and has time to cool off before its turn comes again after the completion of a full rotation of the tool-stock and greatly reduces the Wear on the machine, as idle movements on the tool-stock are entirely avoided and the time necessary for completing a nipple, balltip, cone, or other article is shortened and the Wear on all the mechanisms of the machine correspondingly decreased.

Our improvod screw-machine is operated as follows: The metallic rod or blank in the Work-holder is first fed forward by the clutch and feed device as the same is actuated by the cams on the cam-shaft until the end of the metallic rod abuts against the stop pins or projections of the centering-sleeve. The

article is to be made.

IOO

IIO

action of the tool it is guided in the centeringsleeve, While the end of the metallic rod is held in contact with the stop pins or projections on the centering-sleeve. During the drilling operation the slide-rest has been moved toward the end of the metallic rod, so that the forming-tool acts thereon and imparts the proper exterior shape to the blank. As soon as the drilling and forming tools have performed their Work on the blank the sliderest is moved backward 4and the tool-stock, with its drilling-tool, is Withdrawn and the cutting-tool applied to the blank, so as to cut it off from the metallic rod. The shavings formed by the drilling-tools during the action of the same are moved along the stationary stop pins or projections of the centeringsleeve of the curved arm, so that they clear the end of the centering-sleeve and are finally dropped into a trough located below the operating-tools of the machine.

Vhen the scoring-tool is used in connection with the centering-sleeve, as shown in Figs. 4 to 6, the centering-sleeve, With the scoringtool, is inserted into the eye-shaped end of the curved arm D. W'hen the scoring-tool is brought into action, it is moved forward by the pressure of the tool-socket in the toolstock against the tension of the spring F' toward the face of the metallic rod Which isrotating in contact with the stop-pins, so as to produce the desired scoring, until its shoulder and spring are arrested by the completion of the stroke of the tool in the tool-stock. The length of the stop pins or projections and the distance for which the scoring-tool is moved forward are so proportioned that the desired depth of scoring on the article is produced, in this manner dispensing With the use of the stopping-tool, spotting-tool, and scoring-tool in the tool-stock and permitting the completion of as many pieces as there are tools in the tool-stock for each full rotation of the cam-shaft.

The advantages of our improved attachment for screw-machines as compared to the screw-machines heretofore in use are as follows:

First. It permits the turning out of as many nished pieces for each full rotation of the cam-shaft as there are tools in the tool-stock, While heretofore only one article could be produced for each full rotation of the tool-stock, for the reason that the tools inthe tool-stock had to be brought successively into action. This is obviated by the arrangement of the curved arm, with its centering-sleeve, stop pins or projections, and scoring-tool`, Which arrangement not only saves several operations, but also increases the output of the machine and reduces the Wear on all its mechanisms.

Second. The articles produced are made with greater accuracy, for the reason that the tools in the tool-holder are guided and centered close to their entrance into the blank, whereby vibration orspringin g and the break ing of the drilling-tools arereduced to the minimum, While the scoring-tool serves to form a cavity on the face of the blank where such is desired, the functions of the stoppingtool, centering-tool, and scoring-tool vbeing in our attachment transferred from the toolstock to the centering-sleeve supported in the curved arm.

Third. Our attachment can be applied to any of the automatic screw-machines in use, as the support `for the curved arm can be readily su pei-posed and attached to the bearings of the tubular axle in Which the Workholder is supported, while the cams can be readily changed, so as to produce the motions which are required by the operatingetools during each rotation of the cam-shaft, While for hand-machines no changes in the mechanism of the tool-holder nor in the mechanism of the Work-holder are necessary.

Having thus described our invention, We claim as new and desire to secure by Letters Patentl. The combination, With a screw-machine, of a curved arm supported parallel with the Work-holder and provided With an eye-shaped end or terminal,a centering-sleeve, and means for holding a tool inserted in said sleeve, said centering-sleeve, Work-holder and tool being in axial alinement with each other, substan- `tially as set forth. 2. The combination, with a screw-machine,4

of a curved arm supported parallel with the Work-holder and provided With an eye-shaped end or terminal, a centering-sleeve supported in said terminal,and a tubular spring-actuated scoring-tool guidedin said sleeve, substantially as set forth.

3. The combination, with a screw-machine, of a curved arm supported parallel Wit-h the Work-holder and provided With an eye-shaped IOO end or terminal, and a centering-sleeve supported in said terminal and provided With stop pins or projections on the face of said centering-sleeve, substantially as set forth.

4. An attachment for screw-machines, consisting of a curved arm having an eye-shaped end or terminal, the shank of said arm being supported parallel with the Work-holder, a centering-sleeve supported in said terminal, and a tubular and spring-actuated scoringtool guided in said centering-sleeve, substan.

tially as set forth.

5. An attachment for screw-machines, consisting of a curved arm having an eye-shaped end or terminal, the shank of said arm being supported parallel with the Work-holder of the machine,and a centering-sleeve supported in said terminal and provided with stop pins or projectionsV on the face adjacent to the Work-holder, substantially as set forth.

y 6. The combination, With the Work-holder, tool-stock and slide-rest of a screw-machine, of a curved arm, the shank of which is supported. parallel to said Work-holder, said arm having an eye-shaped end or terminal, a centering-sleeve in said terminal provided With IIO stop pins or projections, a scoring-tool in said centering-sleeve, mechanism for intermittently feeding the metallic rod in the Workholder, and mechanism for intermittently rotating and reciprocating the tool-stock and reciprocating the slide-rest so as to apply one after the other to the blank, substantially asl set forth.

7. The combination, in a screw-machine, of a curved arm supported parallel with the Work-holder, said arm having an eye-shaped vend or terminal, a centering-sleeve in said end or terminal, a centering-sleeve in-said terminal having stop pins or projections on the face adjacent to the Work-holder, a tubular scoring-tool in said centering-sleeve, a tool-stock having a number of tools of the same kind, and mechanism for actuating said tool-stock so that one full reciprocation is made for each feeding action of the Workholder and each reciprocating action of the slide-rest, but only such fractional part of a full rotation equal to a full rotation divided by the number of tools in the tool-stock, substantially as set forth.

In testimony that We claim the foregoing as our invention We have signed our names in presence of two subscribing Witnesses.

WILLIAM K. SANDSTROM. EMIL BOMMER. Witnesses;

PAUL GOEPEL, M. HENRY WURTZEL. 

